The Humphrey Archeological Site, near Mullen in Hooker County, Nebraska, was listed on the National Register of Historic Places in 1974. It was the site of a prehistoric village or camp. The archeological site is designated by Smithsonian trinomial of 25 HO 21. It is a village site which is one of only two known in the Sandhills to show evidence of corn cultivation. It was named for archeologist Humphrey.